<template>
  <div>
    <span>全选:</span>
    <input type="checkbox"  v-model="isCheckedALL"/>
    <button @click="isCheckedALL=!isCheckedALL">反选</button>
    <ul>
      <li v-for="item in arr" :key="item.name">
        <input type="checkbox" v-model="item.checked" />
        <span>{{item.name}}</span>
      </li>
    </ul>
  </div>
</template>
<script>
export default {
  data() {
    return {
      arr: [
        {
          name: "猪八戒",
          checked: true,
        },
        {
          name: "孙悟空",
          checked: false,
        },
        {
          name: "唐僧",
          checked: false,
        },
        {
          name: "白龙马",
          checked: false,
        },
      ],
    };
  },
  computed:{
    isCheckedALL:{
      set(value){
        this.arr.forEach(item => item.checked=value);
      },
      get(){
        return this.arr.every(item=>item.checked)
      }
    }
  }
};
</script>

<style>
</style>